Method for producing an optical lens and optical lens produced by said method
A method for producing an optical lens using an injection mold and to an optical lens produced by the method, wherein, in the method, in a first injection molding step, a first partial body is pre-injection molded in a first cavity and subsequently, in an second injection molding step, in a second cavity, a second partial body is injection molded onto the first partial body, wherein the first partial body and the second partial body are injection molded arranged in front of one another along a thickness axis of the optical lens. The method provides that the first partial body is injection molded with a thickness proportion (a) of 60% to 70% of the total thickness of the optical lens, and wherein the second partial body is injection molded with the remaining thickness proportion (b).
1 . A method for producing an optical lens with an injection mold, the method comprising:
pre-injecting, in a first injection molding step, a first partial body in a first cavity; and
injection molding, in a second injection molding step, in a second cavity, a second partial body onto the first partial body,
wherein the first partial body and the second partial body are injection molded so as to be arranged in front of one another along a thickness axis of the optical lens,
wherein the first partial body is injection molded, such that a thickness of the first partial body along the thickness axis is 60% to 70% of a total thickness of the optical lens along the thickness axis and the second partial body is injection molded, such that a thickness of the second partial body along the thickness axis is a remaining thickness proportion of the total thickness,
wherein the injection mold includes a first mold part and a second mold part that are movable with respect to one another along the thickness axis,
wherein a change from the first cavity to the second cavity occurs by an exchangeable core insert,
wherein the exchangeable core insert includes a first core insert that is provided inside the second mold part during the first injection molding step and a second core insert that is provided inside the second mold part during the second injection molding step, and
wherein the first core insert is removed from the second mold part after the first injection molding step and prior to inserting the second core insert into the second mold part.
2 . The method according to claim 1 , wherein the first partial body is injection molded with a thickness along the thickness axis of 64% to 68% of the total thickness of the optical lens along the thickness axis.
3 . The method according to claim 1 , wherein a partial section of the first cavity is formed with a molding surface having a microstructure which is reproduced on a surface of the first partial body during injection molding.
4 . The method according to claim 3 , wherein the molding surface having the microstructure is provided on the first mold part.
5 . The method according to claim 1 , wherein, after the first injection molding step has taken place, a holding pressure of a plasticized plastic compound that was injected into the first cavity during the first injection molding step is maintained for a period of time in the first cavity.
6 . The method according to claim 1 , wherein, at least during the first injection molding step and the second injection molding step, a temperature of the injection mold at least in an area of sections of the injection mold forming the first cavity and the second cavity is set to a value of 95° C. to 105° C.
7 . The method according to claim 1 , wherein a sprue is arranged relative to the first core insert such that an injected plasticized plastic compound, that forms the first partial body, flows against the first core insert so that a flow body is formed with the first partial body.